MMC Diving Services

"Since 1964"

Telephone: 01983 864 330

  • Underwater Hydro-tightening on Trinity

    Cowes Trinity Landing Pontoon

    MMC Divers use hydraulic torque equipment to tighten underwater joints on Trinity landing.

    A 100 meter long commercial pontoon in the hart of Cowes on the Isle of Wight.


Client: Cowes Harbour Commission

Contractor: Mackley Construction

Duration: 6+ years ongoing

Date posted: 03-12-2013

In the entrance to Cowes, at the heart of the sailing world, the Cowes Harbour Commission appointed Mackley Construction as the main contractor to install Trinity Landing; five 20-tonne commercial heavy duty wave-breaking pontoons. Each measure 100m x 5m with a walk ashore link span. This pontoon has been the landing platform for HRH Queen Elizabeth and Prince Philip amongst other members of the Royal Family.

Docking solutions, now known as Baltic Wharf, designed and fabricated the pontoons with a custom developed solid joint that is as strong as the tubes themselves. This effectively creates one continuous, long pontoon. Unfortunately this system is designed for inland waters or sheltered areas. The short fetch between the mainland and Cowes entrance, combined with a NE wind, creates a short, steep, choppy sea and the pontoons take a hammering.

MMC Diving Services have been contracted since the initial installation and three times a year carry out underwater cutting, burning, and hydro-tightning with specialist hydraulic Hytorc scanners.

Finally, this year the decision has been made to remove the pontoon and make the necessary adjustments to enable the pontoon to flex, rather than keeping the pontoons as one rigid unit.

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